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<a href="socket__buffer_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="detail_2net__flow__fwd_8hpp.html">flow/net_flow/detail/net_flow_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="log_8hpp.html">flow/log/log.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &quot;<a class="code" href="blob_8hpp.html">flow/util/blob.hpp</a>&quot;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &quot;<a class="code" href="util_2util_8hpp.html">flow/util/util.hpp</a>&quot;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &lt;boost/asio.hpp&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#include &lt;boost/shared_ptr.hpp&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="preprocessor">#include &lt;deque&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="preprocessor">#include &lt;ostream&gt;</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>{</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"></span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">/**</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> * Internal `net_flow` class that implements a socket buffer, as used by Peer_socket for Send and</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> * Receive buffers.  Users do not get direct access to such objects, but instead they access them</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * indirectly through things like Peer_socket::send() and Peer_socket::receive().  Meanwhile</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> * Node modifies them directly when data are received or sent over the network.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> *</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * In terms of the API semantics, the object represents a sequence of bytes.  User can enqueue bytes</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> * at the back -- from either a `Const_buffer_sequence` (boost.asio style gather operation) or a</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> * vector of bytes.  User can dequeue bytes from the front -- to either a `Mutable_buffer_sequence`</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> * (boost.asio style scatter operation) or a vector of bytes.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> *</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> * That&#39;s all quite simple, but the complexity comes from performance aspects.  The goal is to avoid</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> * copying arrays (linear-time) and encourage moving them (constant-time) whenever the user enqueues</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * or dequeues some bytes.  To that end, the class can operate in one of two modes (permanently</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * specified at construction), tailored to high performance in the two practical use cases of the</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * class.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> *</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> * #### Mode 1: `block_size_hint == 0` ####</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> * Intended for use as a Receive buffer.  In this case, packetized</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * blocks of data come from the network and can be of arbitrary sizes (though typically they&#39;ll be</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> * max-block-size in length if possible).  They are then converted to a logical byte stream, and the</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * user (via receive()) will dequeue them using a scatter operation.  Since the size(s) of the</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * buffer(s) the user will choose in the scatter receive() are entirely unpredictable, copying of</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> * the bytes during dequeuing is unavoidable.  However, copying the packet blocks while enqueuing a</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> * packet upon receipt IS avoidable; since the Node no longer needs the packet data having given it</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * to the Receive buffer, we can take ownership of the block&#39;s data without copying.</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> *</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> * In mode 1, it is expected the class user will call feed_buf_move() for a constant-time</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> * enqueueing; and the class user will call consume_bufs_copy() for a linear-time dequeuing into the</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> * end user&#39;s (`receive()` caller&#39;s) data structure.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> *</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> * #### Mode 2: `block_size_hint &gt; 0` ####</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> * Intended for use as a Send buffer.  In this case, a stream of bytes</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * comes from the end user (via `send()`), in the form of a sequence of buffers of arbitrary</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * length/structure, which is enqueued into this object.  Node, when it is ready to send a packet,</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * dequeues max-block-size bytes (or fewer, if fewer are available in Socket_buffer), packetizes</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * them, and sends them off.  Node will never ask for fewer than max-block-size bytes (in</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * particular, it will not send anything until congestion window [CWND] has at least that much free</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> * space).  Since the size(s) of the enqueued buffers are entirely unpredictable, copying of the</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> * bytes during enqueueing is unavoidable.  However, copying the packets while dequeueing a packet</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * to send IS avoidable.  How?  During enqueuing, we internally pack bytes into groups of</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> * `block_size_hint` == max-block-size bytes.  Then when a packet is dequeued, we can provide a</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * ready-made front group of bytes with a constant-time operation.</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> *</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * In mode 2, it is expected the class user will call feed_bufs_copy() for a linear-time enqueueing</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> * from the end user&#39;s (`send()` caller&#39;s) data structure; and the class user will call</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * consume_buf_move() for a constant-time dequeuing into a low-level packet.</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> *</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * This narrow design for performance is the reason for the kind-of-odd asymmetrical set of methods</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> * for feeding and consuming bytes.  The two modes differ only in performance, and technically you</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> * may mix and match the recommended calls for the 2 modes after construction.  However that defeats</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> * the point of the class, so I wouldn&#39;t recommend that.</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> *</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> * ### Thread safety ###</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> * Separate objects: All functionality safe for simultaneous execution from multiple</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> * threads.  Same object: Not safe to execute a non-const operation simultaneously with any other</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> * operation; otherwise safe.  Rationale: While locking of Socket_buffer objects is essential, typically</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> * they must be locked together with various other external (to Socket_buffer) pieces of data (such</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> * as a given Peer_socket::m_disconnect_cause), and therefore the locking is left to the user of</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"> * the class.</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> */</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html">   95</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1net__flow_1_1Socket__buffer.html">Socket_buffer</a> :</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  <span class="keyword">public</span> <a class="code hl_class" href="classflow_1_1log_1_1Log__context.html">log::Log_context</a>,</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>  <span class="keyword">private</span> boost::noncopyable <span class="comment">// Definitely discourage copying.  If we make copyable, it&#39;ll be conscious design choice.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>{</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"></span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * Initialize empty buffer.  The block_size_hint argument is an important parameter that</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   * determines the algorithm used for internally storing the bytes supplied via `feed*()`.  While</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   * this has NO effect on the semantics of the output of `consume*()`, it has an effect on internal</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   * performance.</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   *</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   * See Socket_buffer class doc header for explanation of `block_size_hint`.</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   *</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   * @param logger_ptr</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   *        Logger to use for subsequent logging.</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * @param block_size_hint</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">   */</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a42d219bb3431496d13b791ef6ef93934">Socket_buffer</a>(<a class="code hl_class" href="classflow_1_1log_1_1Logger.html">log::Logger</a>* logger_ptr, <span class="keywordtype">size_t</span> block_size_hint);</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment"></span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * The total number of bytes of application-layer data stored in this object.  Intended use case:</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   * estimate of memory usage of this object.</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   *</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   * Note: this only counts the actual user bytes fed into the buffer -- not other internal</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">   * book-keeping.  For example, if the internal storage is a doubly-linked list of byte arrays,</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">   * this will not count the memory used by the previous and next pointers for each node.</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   * Rationale: if we give control over the maximum size to the `net_flow` user, with these semantics</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * it is easier to express and implement what that limit means (even if some side data are not</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   * counted as a result).</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   *</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   */</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#af21cd24bba62da1d16a8fc4f9b8e37fd">data_size</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment"></span> </div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   * Returns true if and only if data_size() == 0.</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   *</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">   * @return Ditto.</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">   */</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac1fc9d1883bb8e6a1e28a6b7e30d90e4">empty</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment"></span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * Feeds (adds to the back of the byte buffer) the contents of the byte stream composed of the</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   * bytes in the given `Const_buffer_sequence`, in the order in which they are given -- up to an</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * internal buffer size.  The data are copied (O(n)) and not modified.</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * As many bytes as possible are copied, subject to the constraint `data_size() &lt;= max_data_size`.</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   * In particular if this is already untrue, no bytes are copied.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   *</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">   * @tparam Const_buffer_sequence</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">   *         Type that models the boost.asio `ConstBufferSequence` concept (see Boost docs).</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment">   *         Basically, it&#39;s any container with elements convertible to `boost::asio::const_buffer`;</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">   *         and bidirectional iterator support.  Examples: `vector&lt;const_buffer&gt;`, `list&lt;const_buffer&gt;`.</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   *         Why allow `const_buffer` instead of, say, `Sequence` of bytes?  Same reason as boost.asio&#39;s</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   *         send functions: it allows a great amount of flexibility without sacrificing performance,</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   *         since `boost::asio::buffer()` function can adapt lots of different objects (arrays,</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   *         vectors, strings, and more of bytes, integers, and more).</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * @param data</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   *        Bytes will be copied from this buffer sequence until exhausted or data_size() equals</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   *        `max_data_size`.</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   * @param max_data_size</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   * @return Number of bytes (possibly zero) by which data_size() increased.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   */</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence&gt;</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a69a0c514df820c36e7109fb1fcf78522">feed_bufs_copy</a>(<span class="keyword">const</span> Const_buffer_sequence&amp; data, <span class="keywordtype">size_t</span> max_data_size);</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment"></span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * Feeds (adds to the back of the byte buffer) the byte sequence equal to the given byte sequence</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * `*data`, up to an internal buffer size.  Any bytes thus fed are cleared from the given buffer.</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * Internally, as much as possible while following the described `block_size_hint` constraints and</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   * the `max_data_size` constraint, move semantics are used, attempting to keep time complexity at</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   * @em O(1).</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   *</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   * As many bytes as possible are taken, subject to the constraint `data_size() &lt;= max_data_size`.</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   * In particular if this is already untrue, no bytes are taken.  If `block_size_hint == 0`, and</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   * `data_size() + data-&gt;size() &lt;= max_data_size`, then time complexity is constant.  Otherwise it is</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * linear in `data-&gt;size()`.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   *</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   * @param data</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   *        Bytes will be moved from this byte byffer until exhausted or data_size() equals</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">   *        `max_data_size`; the bytes thus moved are `erase()`d from `*data`.</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   *        Why make this a `vector` of bytes, and not a `const_buffer`?  Because this allows us to use</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">   *        move semantics to avoid a copy.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">   * @param max_data_size</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   * @return Number of bytes (possibly zero) by which data_size() increased, which equals # of bytes</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">   *         by which `data-&gt;size()` decreased.</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">   */</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a689b49e578de0a3fe7d376dadf296309">feed_buf_move</a>(<a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>* data, <span class="keywordtype">size_t</span> max_data_size);</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment"></span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">   * Consumes (removes from the front of the internal byte buffer and returns them to the caller) a</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   * byte sequence of length data_size() or the available space in `target_bufs` -- whichever is</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   * smaller.  The bytes are removed from the front of the internal byte buffer and are written in</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * the same order, starting from the first byte in `target_bufs`.  The operation involves a copy and</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * has @em O(n) time complexity.</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   *</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   * @tparam Mutable_buffer_sequence</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   *         Type that models the boost.asio `MutableBufferSequence` concept (see Boost docs).</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   *         Basically, it&#39;s any container with elements convertible to `boost::asio::mutable_buffer`;</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   *         and bidirectional iterator support.  Examples: `vector&lt;mutable_buffer&gt;`,</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   *         `list&lt;mutable_buffer&gt;.` Why allow `mutable_buffer` instead of, say, `Sequence` of bytes?</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   *         Same reason as boost.asio&#39;s receive functions: it allows a great amount of flexibility</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   *         without sacrificing performance, since `boost::asio::buffer()` function can adapt lots of</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">   *         different objects (arrays, `vector`s, `string`s, and more of bytes, integers, and more).</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">   * @param target_bufs</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">   *        Buffer sequence into which to copy bytes.</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">   * @return Number of bytes (possibly zero) by which data_size() decreased, which equals the # of</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">   *         bytes copied into `target_bufs`.  This is quite important -- without it there is</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">   *         absolutely no way to know how much of `target_bufs` we&#39;ve used up.</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   */</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Mutable_buffer_sequence&gt;</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#af60133c1d6825246b54f10f26810cd88">consume_bufs_copy</a>(<span class="keyword">const</span> Mutable_buffer_sequence&amp; target_bufs);</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment"></span> </div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">   * Consumes (removes from the front of the internal byte buffer and returns them to the caller) a</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   * byte sequence of length data_size() or `max_data_size` -- whichever is smaller. The bytes are</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   * removed from the front of the internal byte buffer and are written in the same order, starting</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   * from the first byte in `target_buf`.  `*target_buf` is resized to the number of bytes thus</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">   * consumed.  If possible based on certain constraints, the operation avoids copying and has @em O(1)</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">   * time complexity.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">   *</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">   * If `block_size_hint != 0`, and consume_buf_move() is always called with `max_data_size ==</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">   * block_size_hint`, then the time complexity is @em O(1) whenever this is called.  In other uses cases</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   * this is not guaranteed, and the time complexity is @em O(n).</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">   *</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">   * @param target_buf</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">   *        Byte buffer which will be cleared and replaced with the bytes consumed from internal</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">   *        buffer.  Therefore `target_buf-&gt;size()` can be used to know how many bytes were consumed.</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">   *        Performance note: `*target_buf` internal buffer may be reallocated, though this is avoided if reasonably</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">   *        possible (if it already has enough `capacity()`, it is not reallocated).</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">   * @param max_data_size</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">   *        data_size() will not grow beyond this.</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">   */</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a8fe3fe5f6a33cfd8fb84eb2607fbc05b">consume_buf_move</a>(<a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>* target_buf, <span class="keywordtype">size_t</span> max_data_size);</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="comment"></span> </div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="comment">  /// Destroys all stored data.</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span><span class="comment"></span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a38eab6dca9f302d7e280de72dfe62c17">clear</a>();</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span> </div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment"></span> </div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">  /// Short-hand for byte sequence on the heap.  (Using ref-counted pointer purely for convenience.)</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac702b3fcb36a2aed9d129b1255dcfdbc">  244</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac702b3fcb36a2aed9d129b1255dcfdbc">Blob_ptr</a> = boost::shared_ptr&lt;util::Blob&gt;;</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment"></span> </div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">  /// Short-hand for byte sequence on the heap.  (Using ref-counted pointer purely for convenience.)</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a20b11f7f884d1c811573bc2f551c8771">  247</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#a20b11f7f884d1c811573bc2f551c8771">Blob_const_ptr</a> = boost::shared_ptr&lt;const util::Blob&gt;;</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment"></span> </div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">   * FIFO of byte sequences, together comprising an overall byte sequence.  Why not just use a</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">   * `deque&lt;uint8_t&gt;`?  We easily could, and it would make the code far simpler.  Answer: this enables</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">   * us to reduce or eliminate copying of data in certain likely use cases, chief among them when</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">   * using Socket_buffer as the Send buffer.  See #m_q.</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span><span class="comment">   *</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span><span class="comment">   * Why `deque` instead of `list`?  Both offer ~O(1) `push_back()` and `pop_front()`.  `deque` is</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment">   * implemented, in practice, as a set of arrays and a master array with pointers to those arrays.</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">   * `list` is a doubly-linked list.  `deque` is therefore probably more compact and local in memory.</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span><span class="comment">   * `list` may perform less reallocating/copying, depending on how the `deque` implementation works.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span><span class="comment">   * Using `deque` on a hunch, however.  Note, also, that at least gcc 4+ defaults `queue&lt;T&gt;` to</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment">   * `queue&lt;T, deque&gt;`, so I guess they also find it better on average.</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">   *</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">   * Using container instead of adapter `queue` due to need to iterate over the whole thing in some</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">   * situations.</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">   *</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">   * @todo Investigate pros and cons of deque vs. list empirically.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">   */</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a378b7a330d596f81cdf21ea0eb291c11">  267</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#a378b7a330d596f81cdf21ea0eb291c11">Queue</a> = std::deque&lt;Blob_ptr&gt;;</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span> </div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>  <span class="comment">// Friends.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span> </div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>  <span class="comment">// Friend of Socket_buffer: For access to our internals.</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>  <span class="keyword">friend</span> std::ostream&amp; <a class="code hl_friend" href="classflow_1_1net__flow_1_1Socket__buffer.html#aea121167c0d24fe6d493db2717c71a22">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1net__flow_1_1Socket__buffer.html">Socket_buffer</a>&amp; sock_buf);</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span> </div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span><span class="comment"></span> </div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment">   * Helper that copies, to a given raw memory buffer, a given number of bytes from a given</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">   * `Const_buffer_sequence`, starting at a given offset in a given member of that buffer sequence.</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">   * It uses `memcpy()` or similar for copying and makes as few calls to it as possible.  It is similar to the</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment">   * `boost::asio::buffer_copy(ConstBufferSequence -&gt; buffer)` function but also returns the logical</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">   * pointers just past the last byte copied, so that this can be resumed into some other target</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment">   * buffer.  Of course there&#39;s a `buffer_copy(ConstBufferSequence -&gt; MutableBufferSequence)` that</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment">   * would do this, but it would be inefficient for us to have to create a `MutableBufferSequence`.</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment">   *</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span><span class="comment">   * @todo It would not be crazy to move copy_bytes_from_buf_seq() and copy_bytes_to_buf_seq() into util::Blob to make</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="comment">   * it more widely available, though as of this writing there is no demand for this: perhaps a buffer-sequence</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span><span class="comment">   * version of `util::Blob::emplace_copy()` and in the other direction.  In that case `util::Blob::assign_copy()`</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment">   * and all single-buffer util::Blob methods should probably be similarly generalized (overloaded).</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">   *</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   * @tparam Const_buffer_sequence</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   *         See user-facing APIs.</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   * @tparam Const_it</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   *         Iterator type suitable for traversing `Const_buffer_sequence`.</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="comment">   * @param cur_buf_it</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment">   *        Pointer to iterator to the buffer in the buffer sequence from where to begin copying.</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span><span class="comment">   *        When function returns, `*cur_buf_it` will point to the buffer containing the last byte</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span><span class="comment">   *        that was copied.  This can be passed to this method again to resume copying where we</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span><span class="comment">   *        left off.</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span><span class="comment">   * @param pos_in_buf</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="comment">   *        Pointer to offset, in bytes, from the start of `**cur_buf_it` from where to resume</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span><span class="comment">   *        copying.  This must be `&lt;= (*cur_buf_it)-&gt;size()`.  If they are equal (i.e., it points</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">   *        just past the last byte of `**cur_buf_it`), we will properly copy from the start of the</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">   *        next buffer.  (This can happen if the last call to the same method copied exactly</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span><span class="comment">   *        through the end of a buffer in the buffer sequence, and then you call this method again</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span><span class="comment">   *        with the resulting `*cur_buf_it` and `*pos_in_buf`.)</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span><span class="comment">   * @param to_copy</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span><span class="comment">   *        The number of bytes to copy.  The remainder of the buffer sequence (from</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span><span class="comment">   *        `cur_buf_it`/`pos_in_buf` position) MUST contain at least that many bytes.  This means you</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="comment">   *        MUST determine the total byte size of the overall buffer sequence before calling this</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span><span class="comment">   *        function.</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment">   * @param dest_buf</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">   *        (Pointer to) buffer containing `dest` location; data will be written into it.  Must be of</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   *        sufficient size, or behavior is undefined.</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span><span class="comment">   * @param dest</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment">   *        Pointer to the location where bytes will be copied.</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">   */</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence, <span class="keyword">typename</span> Const_it&gt;</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a89291fb233a05b7d449d9c3ebb802341">copy_bytes_from_buf_seq</a>(Const_it* cur_buf_it, <span class="keywordtype">size_t</span>* pos_in_buf,</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>                                      <span class="keywordtype">size_t</span> to_copy,</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span>                                      <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>* dest_buf, util::Blob::Iterator dest);</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span><span class="comment"></span> </div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="comment">   * Helper that copies, to a given raw memory buffer, a given number of bytes to a given</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span><span class="comment">   * `Mutable_buffer_sequence`, starting at a given offset in a given member of that buffer sequence.</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="comment">   * It uses `memcpy()` or similar for copying and makes as few calls to it as possible.  It is the opposite of</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment">   * copy_bytes_from_buf_seq().</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="comment">   *</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span><span class="comment">   * @tparam Mutable_buffer_sequence</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   *         See user-facing APIs.</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span><span class="comment">   * @tparam Const_it</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span><span class="comment">   *         Iterator type suitable for traversing `Mutable_buffer_sequence`.</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span><span class="comment">   * @param cur_buf_it</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span><span class="comment">   *        See copy_bytes_from_buf_seq().</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span><span class="comment">   * @param pos_in_buf</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span><span class="comment">   *        See copy_bytes_from_buf_seq().</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span><span class="comment">   * @param to_copy</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="comment">   *        See copy_bytes_from_buf_seq().</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span><span class="comment">   * @param src_buf</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="comment">   *        Buffer containing `src` location  Must be of sufficient size, or behavior is undefined.</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span><span class="comment">   * @param src</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span><span class="comment">   *        Pointer to the location from where bytes will be copied.</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span><span class="comment">   */</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Mutable_buffer_sequence, <span class="keyword">typename</span> Const_it&gt;</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a45b5068ab3386d99ae7b27047a23ffda">copy_bytes_to_buf_seq</a>(Const_it* cur_buf_it, <span class="keywordtype">size_t</span>* pos_in_buf,</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span>                                    <span class="keywordtype">size_t</span> to_copy,</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span>                                    <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>&amp; src_buf, util::Blob::Const_iterator src);</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span><span class="comment"></span> </div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span><span class="comment">   * The max_data_size argument value that the user is predicting to use when calling</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span><span class="comment">   * consume_buf_move(); or 0 if the user intends to instead use consume_bufs_copy().</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span><span class="comment">   * This is explored in detail in the class doc header.  Basically this should be 0, when this</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span><span class="comment">   * Socket_buffer is used as a Receive buffer; and it should be set to max-block-size, when this</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span><span class="comment">   * Socket_buffer is used as a Send buffer.</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span><span class="comment">   */</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">  356</a></span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a>;</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span><span class="comment"></span> </div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="comment">   * The data in the buffer.  The logical byte sequence, as visible to the outside user of the</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="comment">   * class, is obtained as follows: iterate through range [`m_q[0]-&gt;begin()`, `m_q[0]-&gt;end()`);</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="comment">   * iterate through range [`m_q[1]-&gt;begin()`, `m_q[1]-&gt;end()`); ...; etc.  `shared_ptr`s, instead</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="comment">   * of raw pointers, are used as elements just to avoid having to delete.  Pointers are stored</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span><span class="comment">   * instead of direct vector objects to avoid any wholesale copying by the `deque` machinery.</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment">   *</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span><span class="comment">   * Why not just use a queue of bytes then?  The code would be far simpler.  Answer: the chief use</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span><span class="comment">   * case is if Socket_buffer is Send buffer, so they&#39;ll set `block_size_hint == N` and use</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span><span class="comment">   * feed_bufs_copy() whenever Peer_socket::send() is called.  Then we will always `reserve()` `N` bytes</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span><span class="comment">   * in each `Blob` in #m_q; as `feed*()` is called, we will fill up the last `Blob` sequence until</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span><span class="comment">   * all `N` bytes are exhausted, in which case we&#39;ll `push_back()` another `N`-capacity `Blob` sequence</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span><span class="comment">   * and fill that one as needed, etc.  Since `send()` always copies bytes from user&#39;s buffer(s)</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="comment">   * anyway, we&#39;re not adding any extra copying (only the allocation behavior is different than if</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">   * we&#39;d used a simple byte buffer instead).  Now, when the Node needs to packetize a packet to</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment">   * send, with `max-block-size == N`, it will use consume_buf_move() directly into the packet data</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment">   * structure.  Since Node will avoid sending unless congestion window allows at least `N` bytes to</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span><span class="comment">   * be sent, in consume_buf_move() it will use `max_data_size == N`.  Therefore, consume_buf_move()</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span><span class="comment">   * will be constant-time due to performing a constant-time vector swap.  Thus exactly one data</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span><span class="comment">   * copy is performed including the original `send()` call through sending bytes on the wire.</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span><span class="comment">   */</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">  379</a></span>  <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#a378b7a330d596f81cdf21ea0eb291c11">Queue</a> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>;</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span><span class="comment"></span> </div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span><span class="comment">   * The total amount of data stored, in bytes, stored in this object.  @see data_size() for more</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span><span class="comment">   * discussion.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span><span class="comment">   *</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span><span class="comment">   * Invariant: `m_data_size` = sum(`m-&gt;size()`: for all `m` in `m_q`).</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><span class="comment">   */</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">  387</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>;</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span>}; <span class="comment">// class Socket_buffer</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span> </div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span><span class="comment">// Free functions: in *_fwd.hpp.</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span> </div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span> </div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence&gt;</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a69a0c514df820c36e7109fb1fcf78522">  395</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a69a0c514df820c36e7109fb1fcf78522">Socket_buffer::feed_bufs_copy</a>(<span class="keyword">const</span> Const_buffer_sequence&amp; data, <span class="keywordtype">size_t</span> max_data_size)</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span>{</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>;</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>  <span class="keyword">using </span>boost::asio::buffer_sequence_begin;</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>  <span class="keyword">using </span>boost::asio::buffer_sequence_end;</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>  <span class="keyword">using </span>boost::asio::const_buffer;</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>  <span class="keyword">using </span>boost::asio::buffer_size;</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span>  <span class="keyword">using </span>std::min;</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span> </div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> orig_data_size = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>;</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span> </div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a> == 0)</div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>  {</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>    <span class="comment">/* In this mode, we postpone all re-packetizing until -- possibly -- the data are consume*()d.</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span><span class="comment">     * In other words we just allocate a new buffer for each buffer that comes in and make a</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span><span class="comment">     * direct copy.  They&#39;re not even likely to use this method in this mode (probably they&#39;ll use</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span><span class="comment">     * feed_buf_move() with a Receive buffer instead), but we provide this for completeness.  For</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span><span class="comment">     * more info on the use of this mode, see class doc header or feed_buf_move(). */</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span>    <span class="keywordflow">for</span> (<span class="keyword">auto</span> buf_data_ptr = buffer_sequence_begin(data),</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>              buf_data_end_ptr = buffer_sequence_end(data);</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span>         buf_data_ptr != buf_data_end_ptr; ++buf_data_ptr)</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span>    {</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span>      <span class="keyword">const</span> <span class="keyword">auto</span>&amp; buf_data = *buf_data_ptr;</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span>      <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &gt;= max_data_size)</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>      {</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span>        <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> - orig_data_size;</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>      }</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>      <span class="comment">// else there is space in our buffer.</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span> </div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>      <span class="comment">// Copy entire buffer if possible, but don&#39;t exceed max_data_size bytes in total.</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span>      <span class="keyword">const</span> <span class="keywordtype">size_t</span> to_copy = min(buf_data.size(), <span class="comment">// Could be zero.  This is in BYTES.</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span>                                 max_data_size - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>); <span class="comment">// Definitely &gt;= 1 (checked above).</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span>      <span class="keywordflow">if</span> (to_copy == 0)</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>      {</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>        <span class="keywordflow">continue</span>; <span class="comment">// I guess this buffer was empty... nothing to do for it.</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>      }</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span>      <span class="comment">// else source buffer has data to copy.</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span> </div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span>      <span class="comment">// Get the raw data pointer.</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>      <span class="keyword">const</span> <span class="keyword">auto</span> buf_start = <span class="keyword">static_cast&lt;</span>Blob::value_type <span class="keyword">const </span>*<span class="keyword">&gt;</span>(buf_data.data());</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span> </div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span>      <span class="keyword">const</span> <a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac702b3fcb36a2aed9d129b1255dcfdbc">Blob_ptr</a> buf_copy(<span class="keyword">new</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">Blob</a>(<a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">get_logger</a>()));</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span>      <span class="comment">// Make a byte blob copy from that raw memory.  Performance is highest possible (allocate, copy).</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span>      buf_copy-&gt;assign_copy(const_buffer(buf_start, to_copy));</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span>      <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.push_back(buf_copy);</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span> </div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span>      <span class="comment">// Accounting.</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>      <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> += to_copy;</div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span> </div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Socket_buffer/rcv [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: data_size [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span>                     <span class="stringliteral">&quot;buf_count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.size() &lt;&lt; <span class="stringliteral">&quot;]; fed buffer &quot;</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span>                     <span class="stringliteral">&quot;original/truncated size = [&quot;</span> &lt;&lt; buf_data.size() &lt;&lt; <span class="stringliteral">&quot;/&quot;</span> &lt;&lt; to_copy &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span>      <span class="comment">// Very verbose and CPU-intensive!</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span>      <a class="code hl_define" href="log_8hpp.html#a07561c1c3f16b6c2c7335a09e25298c9">FLOW_LOG_DATA</a>(<span class="stringliteral">&quot;Buffer data [&quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">util::buffers_dump_string</a>(buf_copy-&gt;const_buffer(), <span class="stringliteral">&quot;&quot;</span>, <span class="keywordtype">size_t</span>(-1)) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span>    } <span class="comment">// for (buf_data in data)</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span>  }</div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span>  <span class="keywordflow">else</span> <span class="comment">// if (m_block_size_hint != 0)</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span>  {</div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>    <span class="comment">/* In this, the more likely, use of this method we are attempting to maintain the following</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span><span class="comment">     * invariant:</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span><span class="comment">     *   - Each buffer in m_q is allocated to m_block_size_hint bytes and never reallocated</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span><span class="comment">     *     (so one reserve() call).</span></div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span><span class="comment">     *   - Each buffer in m_q is at capacity, except m_q.back().</span></div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span><span class="comment">     *</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span><span class="comment">     * If the user cooperates by only consuming via consume_buf_move(..., m_block_size_hint), then</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span><span class="comment">     * we will be able to perform no copies in those consume_buf_move() calls, as we can always just</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span><span class="comment">     * swap our byte vector m_q.front() with their empty byte vector (a constant time</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span><span class="comment">     * operation).  This is the likely behavior if *this is used as a Send buffer, as Node will not</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span><span class="comment">     * consume from *this unless it has at least m_block_size_hint (max-block-size in its terms) of</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span><span class="comment">     * congestion window space.</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span><span class="comment">     *</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span><span class="comment">     * Of course we still have to copy here, but in the Send buffer use case that is an advertised</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span><span class="comment">     * given: we must copy the buffer from user data structure as opposed to messing with it. */</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span> </div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span>    <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &gt;= max_data_size)</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span>    {</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span>      <span class="keywordflow">return</span> 0; <span class="comment">// Get rid of this pathological case now.</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span>    }</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span>    <span class="comment">// else some buffer space left.</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span>    <span class="keywordtype">size_t</span> target_space_left = max_data_size - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>;</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span>    <span class="comment">// This will hold how many bytes *this can still still add before exceeding max_data_size.</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span> </div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span>    <span class="keywordtype">size_t</span> src_size_left = buffer_size(data);</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span>    <span class="comment">/* @todo That was a bit inefficient (has to traverse buffer sequence to add up individual sizes).  To avoid</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span><span class="comment">     * it, copy_bytes_from_buf_seq() can be improved at the cost of complexity of its interface.</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span><span class="comment">     * To put it in perspective, the # of buffers is probably ~0.1% of the number of bytes. */</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span>    <span class="keywordflow">if</span> (src_size_left == 0)</div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>    {</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span>      <span class="keywordflow">return</span> 0; <span class="comment">// Get rid of this pathological case now.</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span>    }</div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span>    <span class="comment">// else: src_size_left will hold how many bytes we still haven&#39;t copied from data.</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span> </div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span>    <span class="comment">// Starting source location in memory is first buffer in `data`, byte 0.</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span>    <span class="keyword">auto</span> cur_buf_it = buffer_sequence_begin(data);</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span>    <span class="keywordtype">size_t</span> pos_in_buf = 0;</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span>    <span class="keywordflow">do</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span>    {</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>      <span class="comment">/* The following invariants must hold at the start of this loop iteration:</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span><span class="comment">       *</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span><span class="comment">       *   -1- src_size_left != 0 (guaranteed initially above; and by while condition below).</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span><span class="comment">       *   -2- target_space_left != 0 (ditto).</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span><span class="comment">       *   -3- m_q.back().size() &lt; m_block_size_hint (i.e., still space to write into it).</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span><span class="comment">       *</span></div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span><span class="comment">       * Let us now guarantee -3-. */</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span> </div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>      <span class="comment">// Ensure there is some space in the trailing buffer (space up to m_block_size_hint bytes).</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span>      <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.empty() || (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.back()-&gt;size() == <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a>))</div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>      {</div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>        <span class="comment">// Either the trailing buffer in queue is filled to capacity; or no trailing buffer exists. Make an all-new one.</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span>        <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.push_back(<a class="code hl_typedef" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac702b3fcb36a2aed9d129b1255dcfdbc">Blob_ptr</a>(<span class="keyword">new</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">Blob</a>(<a class="code hl_function" href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">get_logger</a>())));</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span> </div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span>        <span class="comment">// Reserve exactly N bytes of capacity (should be the only allocation for this member).</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span>        <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.back()-&gt;reserve(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a>);</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span>      }</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span>      <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">Blob</a>&amp; target_buf = *<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.back();</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span> </div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span>      <span class="comment">/* Now, decide how many bytes to copy into target_buf. This must be:</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span><span class="comment">       *   - at most target_buf.capacity() - target_buf.size() (maintain exactly m_block_size_hint</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span><span class="comment">       *     bytes allocated in target_buf);</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span><span class="comment">       *   - at most target_space_left (do not exceed m_data_size bytes in *this total);</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span><span class="comment">       *   - at most src_size_left (cannot copy more bytes than available in the source buffer sequence. */</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span>      <span class="keyword">const</span> <span class="keywordtype">size_t</span> to_copy = min(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a> - target_buf.size(), min(target_space_left, src_size_left));</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span> </div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span>      <span class="comment">// Due to invariant mentioned above:</span></div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span>      assert(to_copy != 0);</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span> </div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span>      <span class="comment">/* Do it.  Expand the buffer to receive to_copy bytes.  This is maximally performant.</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span><span class="comment">       *</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span><span class="comment">       * Then, walk along the buffer sequence, memcpy()-ing (etc.) maximally large chunks of data until we</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span><span class="comment">       * got to_copy bytes total.  cur_buf_it and pos_in_buf keep track of where the next copy (if</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span><span class="comment">       * any) will resume. */</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span>      target_buf.resize(target_buf.size() + to_copy);</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span>      copy_bytes_from_buf_seq&lt;Const_buffer_sequence&gt;(&amp;cur_buf_it, &amp;pos_in_buf, to_copy,</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span>                                                     &amp;target_buf, target_buf.end() - to_copy);</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span> </div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span>      target_space_left -= to_copy;</div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span>      src_size_left -= to_copy;</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span>      <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> += to_copy;</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span> </div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span>      <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Socket_buffer/&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">m_block_size_hint</a> &lt;&lt; <span class="stringliteral">&quot; [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: data_size [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span>                     <span class="stringliteral">&quot;buf_count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.size() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span>                     <span class="stringliteral">&quot;fed/total buffer size = [&quot;</span> &lt;&lt; to_copy &lt;&lt; <span class="charliteral">&#39;/&#39;</span> &lt;&lt; target_buf.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span>      <span class="comment">// Very verbose and CPU-intensive!</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span>      <a class="code hl_define" href="log_8hpp.html#a07561c1c3f16b6c2c7335a09e25298c9">FLOW_LOG_DATA</a>(<span class="stringliteral">&quot;Buffer data post-append: &quot;</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span>                    <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">util::buffers_dump_string</a>(target_buf.const_buffer(), <span class="stringliteral">&quot;&quot;</span>, <span class="keywordtype">size_t</span>(-1)) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span>    }</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span>    <span class="keywordflow">while</span> ((src_size_left != 0) &amp;&amp; (target_space_left != 0));</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span>  } <span class="comment">// else if (m_block_size_hint != 0)</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span> </div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span>  <span class="keywordflow">return</span> <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> - orig_data_size;</div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span>} <span class="comment">// Socket_buffer::feed_bufs_copy()</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span> </div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Mutable_buffer_sequence&gt;</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#af60133c1d6825246b54f10f26810cd88">  548</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#af60133c1d6825246b54f10f26810cd88">Socket_buffer::consume_bufs_copy</a>(<span class="keyword">const</span> Mutable_buffer_sequence&amp; target_bufs)</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>{</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>;</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span>  <span class="keyword">using </span>boost::asio::buffer_sequence_begin;</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span>  <span class="keyword">using </span>boost::asio::buffer_size;</div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span>  <span class="keyword">using </span>boost::asio::const_buffer;</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span>  <span class="keyword">using </span>std::min;</div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span> </div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> == 0)</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span>  {</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span>    <span class="keywordflow">return</span> 0; <span class="comment">// Get rid of this pathological case right away.</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span>  }</div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span> </div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> orig_data_size = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>;</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span> </div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span>  <span class="comment">// @todo This is a bit inefficient: O(n) time, where n is the number of buffers in target_bufs.</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span>  <span class="keywordtype">size_t</span> target_size_left = buffer_size(target_bufs);</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span> </div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span>  <span class="keywordflow">if</span> (target_size_left == 0)</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span>  {</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span>    <span class="keywordflow">return</span> 0; <span class="comment">// Another pathological case.</span></div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span>  }</div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span> </div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span>  <span class="comment">/* Now go through each buffer in m_q, until either we run out bytes or fill up the target</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span><span class="comment">   * buffer.  For each buffer in m_q, copy it over into target_bufs. */</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span>  Queue::iterator cur_src_it = <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.begin();</div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span>  <span class="comment">// Starting destination location in memory is first buffer in &quot;target_bufs,&quot; byte 0.</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span>  <span class="keyword">auto</span> cur_buf_it = buffer_sequence_begin(target_bufs);</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span>  <span class="keywordtype">size_t</span> pos_in_buf = 0;</div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span>  <span class="keywordflow">do</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span>  {</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span>    <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">Blob</a>&amp; src_bytes = **cur_src_it;</div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span> </div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span>    <span class="comment">// Normally copy all of current buffer -- unless that would overflow the target Mutable_buffer_sequence.</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span>    <span class="keyword">const</span> <span class="keywordtype">size_t</span> to_copy = min(src_bytes.size(), target_size_left);</div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span> </div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span>    <span class="comment">/* Do it.  Walk along the buffer sequence, memcpy-ing (etc.) maximally large chunks of data into it</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span><span class="comment">     * until we copy to_copy bytes total.  cur_buf_it and pos_in_buf keep track of where the next</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span><span class="comment">     * copy (if any) will resume. */</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span>    copy_bytes_to_buf_seq&lt;Mutable_buffer_sequence&gt;</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span>      (&amp;cur_buf_it, &amp;pos_in_buf, to_copy, src_bytes, src_bytes.const_begin());</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span> </div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span>    <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> -= to_copy;</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span>    target_size_left -= to_copy;</div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span> </div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span>    <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Socket_buffer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: data_size [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span>                   <span class="stringliteral">&quot;slow-consumed buffer of size/total [&quot;</span> &lt;&lt; to_copy &lt;&lt; <span class="charliteral">&#39;/&#39;</span> &lt;&lt; src_bytes.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span>    <span class="comment">// Very verbose and CPU-intensive!</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span>    <a class="code hl_define" href="log_8hpp.html#a07561c1c3f16b6c2c7335a09e25298c9">FLOW_LOG_DATA</a>(<span class="stringliteral">&quot;Buffer data &quot;</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span>                  <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; <a class="code hl_function" href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">util::buffers_dump_string</a>(const_buffer(src_bytes.const_begin(), to_copy),</div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span>                                                   <span class="stringliteral">&quot;&quot;</span>, <span class="keywordtype">size_t</span>(-1))</div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span>                  &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span> </div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span>    <span class="keywordflow">if</span> (to_copy == src_bytes.size())</div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno">  604</span>    {</div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span>      <span class="comment">// Copied entire source buffer -- move to the next one; this one will be erase()ed outside the loop.</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span>      ++cur_src_it;</div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span>    }</div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span>    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span>    {</div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span>      <span class="comment">/* Was limited by the target buffer sequence size; copied only part of source buffer.</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno">  611</span><span class="comment">       * Therefore the loop will not execute again.  Erase the bytes that were just consumed, but</span></div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno">  612</span><span class="comment">       * leave the others alone.  erase() outside the loop will not erase the buffer, as we will not</span></div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno">  613</span><span class="comment">       * ++cur_src_it. */</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno">  614</span>      src_bytes.erase(src_bytes.begin(), src_bytes.begin() + to_copy);</div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno">  615</span>    }</div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno">  616</span>  }</div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno">  617</span>  <span class="keywordflow">while</span> ((target_size_left != 0) &amp;&amp; (<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> != 0));</div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno">  618</span> </div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno">  619</span>  <span class="comment">// All buffers in this range were entirely copied, so now they should be deallocated/removed.</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno">  620</span>  <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.erase(<a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.begin(), cur_src_it);</div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno">  621</span> </div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno">  622</span>  <a class="code hl_define" href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a>(<span class="stringliteral">&quot;Socket_buffer [&quot;</span> &lt;&lt; <span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;] consume finished: data_size [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a> &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno">  623</span>                 <span class="stringliteral">&quot;buf_count [&quot;</span> &lt;&lt; <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">m_q</a>.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno">  624</span> </div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno">  625</span>  <span class="keywordflow">return</span> orig_data_size - <a class="code hl_variable" href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">m_data_size</a>;</div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno">  626</span>} <span class="comment">// Socket_buffer::consume_bufs_copy()</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno">  627</span> </div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno">  628</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Const_buffer_sequence, <span class="keyword">typename</span> Const_it&gt;</div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a89291fb233a05b7d449d9c3ebb802341">  629</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a89291fb233a05b7d449d9c3ebb802341">Socket_buffer::copy_bytes_from_buf_seq</a>(Const_it* cur_buf_it,</div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno">  630</span>                                            <span class="keywordtype">size_t</span>* pos_in_buf, <span class="keywordtype">size_t</span> to_copy,</div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno">  631</span>                                            <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>* dest_buf,</div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno">  632</span>                                            util::Blob::Iterator dest) <span class="comment">// Static.</span></div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno">  633</span>{</div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno">  634</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>;</div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno">  635</span>  <span class="keyword">using </span>boost::asio::const_buffer;</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno">  636</span>  <span class="keyword">using </span>std::min;</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno">  637</span> </div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno">  638</span>  <span class="comment">/* A pre-condition is that *pos_in_buf &lt;= (**cur_buf_it).size().  If it&#39;s strictly less, then</span></div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno">  639</span><span class="comment">   * we will copy into some position in **cur_buf_it.  If it is equal, then we need to go to the</span></div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno">  640</span><span class="comment">   * next buffer -- actually the next non-empty buffer.  Why do we allow the == case?  Because if we</span></div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno">  641</span><span class="comment">   * end the copying in an earlier invocation by copying the very last byte in a buffer, then the</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno">  642</span><span class="comment">   * final *pos_in_buf will indeed equal .size() of that buffer.  So basically, we leave</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno">  643</span><span class="comment">   * *pos_in_buf at the value it is after a copy, regardless of whether that&#39;s in the middle or end</span></div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno">  644</span><span class="comment">   * of the buffer.  Then if we *need* to, we will go to the next non-empty buffer. */</span></div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno">  645</span> </div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno">  646</span>  <span class="comment">// Keep decreasing to_copy until all copied.  A pre-condition is that the buffer sequence has enough bytes total.</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno">  647</span>  <span class="keywordflow">while</span> (to_copy != 0)</div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno">  648</span>  {</div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno">  649</span>    <span class="comment">// At this point *pos_in_buf &lt;= .size().  We must copy, so if they&#39;re equal, find next non-empty buffer.</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno">  650</span>    <span class="keywordtype">size_t</span> cur_buf_size;</div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno">  651</span>    <span class="keywordflow">while</span> (*pos_in_buf == (cur_buf_size = (*cur_buf_it)-&gt;size()))</div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno">  652</span>    {</div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno">  653</span>      ++*cur_buf_it;</div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno">  654</span>      *pos_in_buf = 0; <span class="comment">// If the next buffer is empty, this will equal .size() (0).</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno">  655</span>    }</div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno">  656</span>    <span class="comment">// Since we are guaranteed buffer sequence has enough bytes to satisfy to_copy, **cur_buf_it must be a buffer.</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno">  657</span> </div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno">  658</span>    <span class="comment">// Destination buffer may be larger than what we still have to copy.</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno">  659</span>    <span class="keyword">const</span> <span class="keywordtype">size_t</span> to_copy_in_buf = min(to_copy, cur_buf_size - *pos_in_buf);</div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno">  660</span>    <span class="comment">/* This is the reason for using this function instead of buffer_iterator (which would&#39;ve been much easier -- but</span></div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno">  661</span><span class="comment">     * this is way faster and probably uses memcpy() or similar). */</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno">  662</span>    dest = dest_buf-&gt;emplace_copy(dest,</div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno">  663</span>                                  const_buffer(<span class="keyword">static_cast&lt;</span>Blob::Const_iterator<span class="keyword">&gt;</span>((*cur_buf_it)-&gt;data()) + *pos_in_buf,</div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno">  664</span>                                               to_copy_in_buf));</div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno">  665</span> </div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno">  666</span>    to_copy -= to_copy_in_buf;</div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno">  667</span>    *pos_in_buf += to_copy_in_buf;</div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno">  668</span>    <span class="comment">// Note that if to_copy != 0 right now, then *pos_in_buf points just past end of current buffer.</span></div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno">  669</span>  }</div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno">  670</span>} <span class="comment">// Socket_buffer::copy_bytes_from_buf_seq()</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno">  671</span> </div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno">  672</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Mutable_buffer_sequence, <span class="keyword">typename</span> Const_it&gt;</div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno"><a class="line" href="classflow_1_1net__flow_1_1Socket__buffer.html#a45b5068ab3386d99ae7b27047a23ffda">  673</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1net__flow_1_1Socket__buffer.html#a45b5068ab3386d99ae7b27047a23ffda">Socket_buffer::copy_bytes_to_buf_seq</a>(Const_it* cur_buf_it,</div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno">  674</span>                                          <span class="keywordtype">size_t</span>* pos_in_buf, <span class="keywordtype">size_t</span> to_copy,</div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno">  675</span>                                          <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>&amp; src_buf,</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno">  676</span>                                          util::Blob::Const_iterator src) <span class="comment">// Static.</span></div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno">  677</span>{</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno">  678</span>  <span class="comment">/* This is almost exactly the same as copy_bytes_from_buf_seq() -- just in the other direction.</span></div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno">  679</span><span class="comment">   * Basically memcpy() (or similar) arguments are switched.  So I&#39;ll keep comments minimal -- see the other</span></div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno">  680</span><span class="comment">   * method.</span></div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno">  681</span><span class="comment">   * @todo Code reuse somehow.  It&#39;s possible but may not be worth it given the small volume of code</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno">  682</span><span class="comment">   * involved. */</span></div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno">  683</span> </div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno">  684</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">util::Blob</a>;</div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno">  685</span>  <span class="keyword">using </span>boost::asio::mutable_buffer;</div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno">  686</span>  <span class="keyword">using </span>std::min;</div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno">  687</span> </div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno">  688</span>  <span class="keywordflow">while</span> (to_copy != 0)</div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno">  689</span>  {</div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno">  690</span>    <span class="keywordtype">size_t</span> cur_buf_size;</div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno">  691</span>    <span class="keywordflow">while</span> (*pos_in_buf == (cur_buf_size = (*cur_buf_it)-&gt;size()))</div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno">  692</span>    {</div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno">  693</span>      ++*cur_buf_it;</div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno">  694</span>      *pos_in_buf = 0;</div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno">  695</span>    }</div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno">  696</span> </div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno">  697</span>    <span class="keyword">const</span> <span class="keywordtype">size_t</span> to_copy_in_buf = min(to_copy, cur_buf_size - *pos_in_buf);</div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno">  698</span>    src = src_buf.sub_copy(src,</div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno">  699</span>                           mutable_buffer(<span class="keyword">static_cast&lt;</span>Blob::Iterator<span class="keyword">&gt;</span>((*cur_buf_it)-&gt;data()) + *pos_in_buf,</div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno">  700</span>                                          to_copy_in_buf));</div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno">  701</span> </div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno">  702</span>    to_copy -= to_copy_in_buf;</div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno">  703</span>    *pos_in_buf += to_copy_in_buf;</div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno">  704</span>  }</div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno">  705</span>} <span class="comment">// Socket_buffer::copy_bytes_to_buf_seq()</span></div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno">  706</span> </div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno">  707</span>} <span class="comment">// namespace flow::net_flow</span></div>
<div class="ttc" id="ablob_8hpp_html"><div class="ttname"><a href="blob_8hpp.html">blob.hpp</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Log__context_html"><div class="ttname"><a href="classflow_1_1log_1_1Log__context.html">flow::log::Log_context</a></div><div class="ttdoc">Convenience class that simply stores a Logger and/or Component passed into a constructor; and returns...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01609">log.hpp:1610</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Log__context_html_af4db395042b065b00398cd59845dcb4d"><div class="ttname"><a href="classflow_1_1log_1_1Log__context.html#af4db395042b065b00398cd59845dcb4d">flow::log::Log_context::get_logger</a></div><div class="ttdeci">Logger * get_logger() const</div><div class="ttdoc">Returns the stored Logger pointer, particularly as many FLOW_LOG_*() macros expect.</div><div class="ttdef"><b>Definition:</b> <a href="log_8cpp_source.html#l00217">log.cpp:217</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Logger_html"><div class="ttname"><a href="classflow_1_1log_1_1Logger.html">flow::log::Logger</a></div><div class="ttdoc">Interface that the user should implement, passing the implementing Logger into logging classes (Flow'...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01280">log.hpp:1284</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html">flow::net_flow::Socket_buffer</a></div><div class="ttdoc">Internal net_flow class that implements a socket buffer, as used by Peer_socket for Send and Receive ...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00095">socket_buffer.hpp:98</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a1cb77c80c42fd6b6ac86df5052f552ea"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a1cb77c80c42fd6b6ac86df5052f552ea">flow::net_flow::Socket_buffer::m_data_size</a></div><div class="ttdeci">size_t m_data_size</div><div class="ttdoc">The total amount of data stored, in bytes, stored in this object.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00387">socket_buffer.hpp:387</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a20b11f7f884d1c811573bc2f551c8771"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a20b11f7f884d1c811573bc2f551c8771">flow::net_flow::Socket_buffer::Blob_const_ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; const util::Blob &gt; Blob_const_ptr</div><div class="ttdoc">Short-hand for byte sequence on the heap. (Using ref-counted pointer purely for convenience....</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00247">socket_buffer.hpp:247</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a378b7a330d596f81cdf21ea0eb291c11"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a378b7a330d596f81cdf21ea0eb291c11">flow::net_flow::Socket_buffer::Queue</a></div><div class="ttdeci">std::deque&lt; Blob_ptr &gt; Queue</div><div class="ttdoc">FIFO of byte sequences, together comprising an overall byte sequence.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00267">socket_buffer.hpp:267</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a38eab6dca9f302d7e280de72dfe62c17"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a38eab6dca9f302d7e280de72dfe62c17">flow::net_flow::Socket_buffer::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Destroys all stored data.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00170">socket_buffer.cpp:170</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a42d219bb3431496d13b791ef6ef93934"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a42d219bb3431496d13b791ef6ef93934">flow::net_flow::Socket_buffer::Socket_buffer</a></div><div class="ttdeci">Socket_buffer(log::Logger *logger_ptr, size_t block_size_hint)</div><div class="ttdoc">Initialize empty buffer.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00026">socket_buffer.cpp:26</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a45b5068ab3386d99ae7b27047a23ffda"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a45b5068ab3386d99ae7b27047a23ffda">flow::net_flow::Socket_buffer::copy_bytes_to_buf_seq</a></div><div class="ttdeci">static void copy_bytes_to_buf_seq(Const_it *cur_buf_it, size_t *pos_in_buf, size_t to_copy, const util::Blob &amp;src_buf, util::Blob::Const_iterator src)</div><div class="ttdoc">Helper that copies, to a given raw memory buffer, a given number of bytes to a given Mutable_buffer_s...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00673">socket_buffer.hpp:673</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a689b49e578de0a3fe7d376dadf296309"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a689b49e578de0a3fe7d376dadf296309">flow::net_flow::Socket_buffer::feed_buf_move</a></div><div class="ttdeci">size_t feed_buf_move(util::Blob *data, size_t max_data_size)</div><div class="ttdoc">Feeds (adds to the back of the byte buffer) the byte sequence equal to the given byte sequence *data,...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00039">socket_buffer.cpp:39</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a69a0c514df820c36e7109fb1fcf78522"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a69a0c514df820c36e7109fb1fcf78522">flow::net_flow::Socket_buffer::feed_bufs_copy</a></div><div class="ttdeci">size_t feed_bufs_copy(const Const_buffer_sequence &amp;data, size_t max_data_size)</div><div class="ttdoc">Feeds (adds to the back of the byte buffer) the contents of the byte stream composed of the bytes in ...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00395">socket_buffer.hpp:395</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a89291fb233a05b7d449d9c3ebb802341"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a89291fb233a05b7d449d9c3ebb802341">flow::net_flow::Socket_buffer::copy_bytes_from_buf_seq</a></div><div class="ttdeci">static void copy_bytes_from_buf_seq(Const_it *cur_buf_it, size_t *pos_in_buf, size_t to_copy, util::Blob *dest_buf, util::Blob::Iterator dest)</div><div class="ttdoc">Helper that copies, to a given raw memory buffer, a given number of bytes from a given Const_buffer_s...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00629">socket_buffer.hpp:629</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_a8fe3fe5f6a33cfd8fb84eb2607fbc05b"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#a8fe3fe5f6a33cfd8fb84eb2607fbc05b">flow::net_flow::Socket_buffer::consume_buf_move</a></div><div class="ttdeci">void consume_buf_move(util::Blob *target_buf, size_t max_data_size)</div><div class="ttdoc">Consumes (removes from the front of the internal byte buffer and returns them to the caller) a byte s...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00103">socket_buffer.cpp:103</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_ab9d0faeeb2a8d1058b24319e8a14e52a"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#ab9d0faeeb2a8d1058b24319e8a14e52a">flow::net_flow::Socket_buffer::m_q</a></div><div class="ttdeci">Queue m_q</div><div class="ttdoc">The data in the buffer.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00379">socket_buffer.hpp:379</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_ac1fc9d1883bb8e6a1e28a6b7e30d90e4"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#ac1fc9d1883bb8e6a1e28a6b7e30d90e4">flow::net_flow::Socket_buffer::empty</a></div><div class="ttdeci">bool empty() const</div><div class="ttdoc">Returns true if and only if data_size() == 0.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00165">socket_buffer.cpp:165</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_ac55db5220a1349e3a6fd5d268cd8a2ed"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#ac55db5220a1349e3a6fd5d268cd8a2ed">flow::net_flow::Socket_buffer::m_block_size_hint</a></div><div class="ttdeci">const size_t m_block_size_hint</div><div class="ttdoc">The max_data_size argument value that the user is predicting to use when calling consume_buf_move(); ...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00356">socket_buffer.hpp:356</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_ac702b3fcb36a2aed9d129b1255dcfdbc"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#ac702b3fcb36a2aed9d129b1255dcfdbc">flow::net_flow::Socket_buffer::Blob_ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; util::Blob &gt; Blob_ptr</div><div class="ttdoc">Short-hand for byte sequence on the heap. (Using ref-counted pointer purely for convenience....</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00244">socket_buffer.hpp:244</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_aea121167c0d24fe6d493db2717c71a22"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#aea121167c0d24fe6d493db2717c71a22">flow::net_flow::Socket_buffer::operator&lt;&lt;</a></div><div class="ttdeci">friend std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Socket_buffer &amp;sock_buf)</div><div class="ttdoc">Prints a printable representation of the data in sock_buf to the given standard ostream.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00176">socket_buffer.cpp:176</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_af21cd24bba62da1d16a8fc4f9b8e37fd"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#af21cd24bba62da1d16a8fc4f9b8e37fd">flow::net_flow::Socket_buffer::data_size</a></div><div class="ttdeci">size_t data_size() const</div><div class="ttdoc">The total number of bytes of application-layer data stored in this object.</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8cpp_source.html#l00034">socket_buffer.cpp:34</a></div></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Socket__buffer_html_af60133c1d6825246b54f10f26810cd88"><div class="ttname"><a href="classflow_1_1net__flow_1_1Socket__buffer.html#af60133c1d6825246b54f10f26810cd88">flow::net_flow::Socket_buffer::consume_bufs_copy</a></div><div class="ttdeci">size_t consume_bufs_copy(const Mutable_buffer_sequence &amp;target_bufs)</div><div class="ttdoc">Consumes (removes from the front of the internal byte buffer and returns them to the caller) a byte s...</div><div class="ttdef"><b>Definition:</b> <a href="socket__buffer_8hpp_source.html#l00548">socket_buffer.hpp:548</a></div></div>
<div class="ttc" id="adetail_2net__flow__fwd_8hpp_html"><div class="ttname"><a href="detail_2net__flow__fwd_8hpp.html">net_flow_fwd.hpp</a></div></div>
<div class="ttc" id="alog_8hpp_html"><div class="ttname"><a href="log_8hpp.html">log.hpp</a></div></div>
<div class="ttc" id="alog_8hpp_html_a07561c1c3f16b6c2c7335a09e25298c9"><div class="ttname"><a href="log_8hpp.html#a07561c1c3f16b6c2c7335a09e25298c9">FLOW_LOG_DATA</a></div><div class="ttdeci">#define FLOW_LOG_DATA(ARG_stream_fragment)</div><div class="ttdoc">Logs a DATA message into flow::log::Logger *get_logger() with flow::log::Component get_log_component(...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00242">log.hpp:242</a></div></div>
<div class="ttc" id="alog_8hpp_html_affcf2e4c496ce3f42adf981669c623b8"><div class="ttname"><a href="log_8hpp.html#affcf2e4c496ce3f42adf981669c623b8">FLOW_LOG_TRACE</a></div><div class="ttdeci">#define FLOW_LOG_TRACE(ARG_stream_fragment)</div><div class="ttdoc">Logs a TRACE message into flow::log::Logger *get_logger() with flow::log::Component get_log_component...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00227">log.hpp:227</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html"><div class="ttname"><a href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div><div class="ttdoc">Flow module containing the API and implementation of the Flow network protocol, a TCP-inspired stream...</div><div class="ttdef"><b>Definition:</b> <a href="asio_2node_8cpp_source.html#l00024">node.cpp:25</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a16357344c21456b86b7de3085e2661a2"><div class="ttname"><a href="namespaceflow_1_1util.html#a16357344c21456b86b7de3085e2661a2">flow::util::buffers_dump_string</a></div><div class="ttdeci">std::string buffers_dump_string(const Const_buffer_sequence &amp;data, const std::string &amp;indentation, size_t bytes_per_line)</div><div class="ttdoc">Identical to buffers_to_ostream() but returns an std::string instead of writing to a given ostream.</div><div class="ttdef"><b>Definition:</b> <a href="util_2util_8hpp_source.html#l00506">util.hpp:506</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_af09888b3a8feaff209b6625e493bc338"><div class="ttname"><a href="namespaceflow_1_1util.html#af09888b3a8feaff209b6625e493bc338">flow::util::Blob</a></div><div class="ttdeci">Blob_with_log_context&lt;&gt; Blob</div><div class="ttdoc">A concrete Blob_with_log_context that compile-time-disables Basic_blob::share() and the sharing API d...</div><div class="ttdef"><b>Definition:</b> <a href="blob__fwd_8hpp_source.html#l00060">blob_fwd.hpp:60</a></div></div>
<div class="ttc" id="autil_2util_8hpp_html"><div class="ttname"><a href="util_2util_8hpp.html">util.hpp</a></div></div>
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